Data Auto-Backup System

5. The data auto-backup system as claimed in claim 2, wherein the identifiable condition is met when the ID information is same as an identifiable device information pre-stored in the application.

11. The data auto-backup system as claimed in claim 1, wherein each cloud file includes a file related information including a file access record; the cloud file is as a critical file when an accessed frequency of the cloud file is higher than a frequency threshold, or when a last accessed time of the cloud file is within a predetermined time period, according to the file access record.